Hopatcong, NJ has a population of 14,633 and is the 2,892nd largest city in the United States. The population density is 1,344 per sq mi which is 11% higher than the New Jersey average and 1384% higher than the national average. The median age in Hopatcong is 43 which is approximately 10% higher than the New Jersey average of 40. In Hopatcong, 61% of the population over 15 years of age are married, 83% speak English and 9% speak Spanish. 67% of Hopatcong residents were born in New Jersey, 20% were born out of state, 1% were born outside of the United States and 11% were foreign born.